Folding trestle.



W. W. HORN.

FOLDING TRESTLE.

Mmc/mon FILED AUG4 7, 19m.

1,1 75,522. lamnfd Mui.. 14,1910.

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WILLIAM W. HORN', 0F 'CHICGQ ILLINOIS.

FOLDING TRESTLE.

Specication of Letters Patent.

Patented Mar. 1d, 1916.

application and august 7, 1915. serial ne. eelco.

To all lwlwm 'it may concern:

Be it known that I, WILLIAM W. HORN, a citizen of the United States of America, and a resident of Chicago, inthe vcounty of `Cook and State of Illinois, have invented certain new and useful llmprovements in Foldingv'lrestles, of which the following is a specification.l

This invention relates to that class of folding trestles for builders and like uses, which forms the subject matter of my prior LettersPatent, No. 1,143,397, dated June 15th, 1915. And the present improvement has for its object to provide asimple and substantial structural formation and combination of parts adapted to fold 'compactly together and when unfolded is capable of vertical extension to varied requirements as to height in building operations, all as will hereinafter more fully appear.

vln the accompanying drawings :'-Figure 1, is a side elevation of an end portion of the trestle in anunfolded condition for use. Fig. 2, is an end elevation of the same, parts beingshown in section. Fig. 3, is a detail horizontal section on line -A-w, Fig. 2.

Similar reference Vnumerals. indicate like parts in theseveral views.

Referring to the drawings, 1 designates the longitudinal supporting rail of the tres'- tle, 'preferably formed of structural T iron, as shown with 'its vertical web 2, vadapted to form a' connecting element for the folding trejstle legs hereinafter described. y

3 designates a pair of pivot plates, which are pivotedat opposite sides of the vertical web 2 aforesaid by. hinge pins, or rivets 4, passing through orifices in end portions of said plates as shown.

5 designates a spacing plate secured be-v tween the pivot plates 3 by rivets or other usual fastening means and adapted to hold said plates in proper -spaced relation. The lower portion of the spacing plate 5 de'- pends a distance below, the pivot Aplates.

aforesaid, for theattachment ofthe upper member or section of the extension leg of the trestle hereinafter described.

6 designates alined orifices formed in the pair of hinge plates 3 and inthe web. 2 of the'supporting rail 1, and adapted to re-lY ceive a locking pin 7, for locking the hinge plate and Asupporting rail in an unfolded condition.

,The supporting legs of the trestle are made extensible and are preferably yformed in three sections to-wit: an upper section 8, an lntermediate section 9, anda lower or base section l0, hereinafter described in detail. The upper leg section 8, aforesaid, is preferably formed of wrou ht metal tubing, with its upper end split an :spread apart to form a yoke for the reception of the lower portlon of the spacing plate 5, to which it is riveted or otherwise secured in a fixed and substantial manner. Theintermediate leg section 9, aforesaid, is also formed preferablyl of wrought metal tubing, having an l`internal diameter greater than, the external diameter of the upper leg section 8 aforesaid, so as to slidingly receive said'u per leg section 8 which is guided therein y a cap piece 11, on vthe upper end of said intermediate leg section 9.. The lower leg section 10, aforesaid, is formed `in part of wroughtv metaltubing of a larger diameter than the intermediate leg section 9, with its bore ofsuilicient diameter to slidinglyv receive said intermediate leg section .9, which is guided therein by a cap piece 12 on the upperend of the lower leg section 10. Said lower leg section 10 in addition comprises a pair of laterally spread` or inclined -legs .or braces 13, preferably of wrought metal vtubing, and which are secured to theabove mentioned tubular member 10, by means as follows: 14 designates a transverse plate secured tothe member 10, aforesaid by a clip plate 15, disposed beneath the cap piece 12, of said member 10. Said clip plate 15 is,0f, less height Lthan the plate 14:, so as to leave the lower portionthereof free for the attachment of the upper ends of the inclined legs 13 aforesaid, which are dattened for su'ch purpose and riveted or otherwise secured to the transverse plate 14, as illus, trated. in Figs. 1 and 2. ldesignates a `transverse tie bar secured at its respective ends to thefinclined legs. 13 aforesaid, and

at its midlength to the tubular leg section or member 10 by a U bolt or clip 17, as shown. 18 and 19 designate vertical series of holes, formed in the leg sections 8 and 9, and adapted to receive pins 20 and 21, by which they are 'held to the desired vertical adjustment during use.v The leg sections 8 and 9 may, when so desired, be provided with stop collars or enlargements 22 'on their lower ends, adapted forcontact with the guide caps 11 and 12 of 110 the respective parts, to prevent accidental disassoci'atien et the trestle parts.

ffl-Hering .thns described saii'd` in-.

vention what` I Claim as new and desire t'o `-1'. A folding trestle'V cemprieing', 'al sig;-

`I5 portin rail haing'a dependingflongitu vnal we a pair of hinge plates pivoted 'at ene end'to; the .lngitudinal `Web foresaid,

' spacing plate imposing-spaced relation on l lsaid hinge lates, Za sectional trestle'leg, lthe.

upper inem er of which is formed into 'a yokefat itsnpper end adapted to receive .the

lowerv pdrtioh ofthe 'aforesaid -spacingplate' glu-tes, means for-iste-4 said yoket 4 said"- hinge plates :end l'on ituclinal web Aaforesaid together,A substantial y nel set; forth;

2.`A folding trestle ,eonllprisingg` asupprting rail', .and e' jseetional-vtrestle legbers thelinpge'r eneoffwhfehlhas hin-ge connetion ori-.ing riiilafdresaid and tial. tubular portieniof sai lower inember yn tzrnsverse plate anda-'e plate; sub`- 

